Washington: President Donald Trump said the US is "demanding" answers from Saudi Arabia over the mysterious disappearance of Saudi journalist Jamal Khashoggi from Saudi consulate on October 2.

Speaking to reporters, Trump said he is in constantly touch with Saudi authorities and had discussed the matter with the top brass of Saudi administration.

"This is a bad situation. We cannot let this happen, to reporters, to anybody. We can't let this happen. And we're going to get to the bottom of it," Trump said.

"We are demanding everything, and we want to see what's going on here. That's a bad situation and frankly the fact that it's a reporter, you could say in many respects it makes it, it brings it to a level, it's a very serious situation for us and for this White House. We do not like seeing what's going on. Now as you know they're saying we had nothing to do with it but so far everyone saying they had nothing to do with it and it's inside of Turkey and the Turkish government is working very strongly so far, so we'll see what happens," he added.

US state secretary Mike Pompeo Tuesday had also spoken to Saudi Crown Prince Mohammed Bin Salman about the missing of the Washington Post scribe.

Yesterday, A Turkish television station had aired surveillance video of missing the missing journalist walking into the Saudi Consulate in Istanbul and a black van leaving later for the consul's home.

State-run broadcaster TRT aired still images and video purportedly showing the Saudis arriving by private jet and then leaving a hotel.

The footage shows Khashoggi entering the consulate. An hour-and-54 minutes later, according to the time stamp, a black Mercedes Vito with diplomatic license plates, which resembled a van parked outside of the consulate when the writer walked in, drives some two kilometres (1.2 miles) to the consul's home, where it parks inside a garage.

The footage all seemed to come from surveillance cameras, which would have been posted throughout the district housing the Saudi consulate and other diplomatic missions.

No one has produced any footage of Khashoggi leaving the consulate.

The Sabah newspaper, which is close to Turkish President Recep Tayyip Erdogan, published images of what it referred to as the "assassination squad" apparently taken at passport control.

It said they checked into two hotels in Istanbul on 2 October and left later that day.

The release of the photographs and video raises pressure on Saudi Arabia a week after Khashoggi disappeared during a visit to the consulate. Turkish officials fear that the team killed the writer.